Timestamp Converter - Unix Epoch to Date & Vice Versa
Free online Unix timestamp converter. Instantly convert epoch timestamps (seconds & milliseconds) to readable dates in UTC and local time, and vice versa.
Updated
What is the Timestamp Converter - Unix Epoch to Date & Vice Versa?
Unix Timestamp Converter
Convert Unix timestamps (epoch time) to human-readable dates and back instantly and accurately.
What It Does
This free, client-side tool converts between:
- Unix timestamp → Date
- Date → Unix timestamp
It supports both:
- Seconds (10-digit timestamps)
- Milliseconds (13-digit timestamps) with smart auto-detection
Output Formats
The converter displays results in multiple formats:
- UTC time
- Local timezone
- ISO 8601 format
- Relative time (e.g., “2 hours ago”)
Who It’s For
This tool is especially useful for:
- Developers working with APIs and backend systems
- Data analysts processing time-series data
- System administrators reviewing logs
- Anyone debugging timestamps in databases or applications
Key Benefits
- Instant bidirectional conversion
- Automatic detection of timestamp format
- Clean, multi-format time output
- Fully client-side processing for privacy and speed
- No data is sent to any server
How it works
How to Use the Unix Timestamp Converter
1. Choose Direction
Select one of the two tabs:
- Timestamp → Date
- Date → Timestamp
2. Enter Your Input
Depending on the selected mode:
For timestamps:
Enter a numeric Unix timestamp
Supports both:
- Seconds (10-digit)
- Milliseconds (13-digit)
Or use the “Use current time” shortcut
For dates:
Use the native datetime picker
Or manually enter an ISO 8601 string
3. View Rich Results
The converter instantly displays multiple formats:
- Unix timestamp (with unit detection)
- UTC formatted time
- Local time (formatted and ISO)
- Relative time (e.g., “5 hours ago”, “in 3 days”)
- One-click copy buttons for each output format
Privacy & Processing
All conversions run entirely in your browser.
No data is sent, stored, or transmitted to any server.
Examples
Convert Unix Timestamp to Date
Decode a common 10-digit Unix timestamp from logs or APIs.
Convert JavaScript Millisecond Timestamp
Handle 13-digit timestamps commonly returned by JS Date.now().
Generate Timestamp from Date
Create a timestamp for a future or past event (e.g., scheduling).
Frequently asked questions
What is a Unix timestamp (epoch time)?
What is a Unix timestamp (epoch time)?
A Unix timestamp (also called epoch time) represents the number of seconds or milliseconds that have elapsed since January 1, 1970, 00:00:00 UTC (the Unix epoch). Key characteristics:
- Fully timezone-independent (based on UTC).
- Widely used in programming, databases, and APIs.
- Provides a compact way to store date and time values.
- Easy to compare, sort, and compute time differences.
What is the difference between seconds and milliseconds?
What is the difference between seconds and milliseconds?
Unix timestamps can be represented in different levels of precision depending on the system.
- Seconds (10-digit timestamps):
- Common in PHP, MySQL, Linux, and many backend systems.
- Milliseconds (13-digit timestamps):
- Common in JavaScript, Java, and modern APIs. This tool can:
- Automatically detect the timestamp format.
- Allow manual selection between seconds and milliseconds.
- Convert between both formats instantly.
Are timestamps affected by timezones?
Are timestamps affected by timezones?
No. Unix timestamps always represent a fixed point in time.
- Stored relative to UTC.
- The numeric value does not change based on location.
- Only the displayed human-readable date varies depending on timezone.
- Ideal for distributed systems and global applications.
Does this tool work offline?
Does this tool work offline?
Yes. All timestamp conversions happen directly in your browser.
- No data is sent to any server.
- No internet connection is required after loading the page.
- Conversions are instant and private.
- Your data remains entirely on your device.
What about dates before 1970?
What about dates before 1970?
Yes, dates before the Unix epoch are fully supported.
- Dates before January 1, 1970 are represented using negative timestamps.
- These negative values correctly map to historical dates and times.
- Useful for working with archival, historical, or legacy datasets.
- Accuracy depends on the supported range of JavaScript Date objects.
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